Blower Door Test during construction not considered/What now?

In my opinion, there is no such concept with us.

Hello, excuse me for the question, how can I write a post?

Hello Nordanney,

actually, that's €uro's field of expertise ...

For the KfW, a blower door test is not mandatory! But then, as far as I know, something is calculated differently in the thermal insulation certificate

This statement is not correct:

"If a ventilation system is planned and funding is to be applied for, a blower door test as proof of airtightness is mandatory. Because for a ventilation system to work flawlessly and efficiently, increased requirements for airtightness must be met"

Source: e.g., Energy Consulting RWE

Rhineland regards

Hello Nordanney,

actually €uro's area of expertise ...

This statement is not correct:

"If a ventilation system is planned and funding is to be applied for, a BlowerDoor test is mandatory as proof of airtightness. Because for a ventilation system to work properly and efficiently, there are increased requirements for airtightness"

Source: For example: Energy consulting RWE

Rhineland greetings

Then €uro could actually shed some light on this
According to our planner, we can do without the BDT, reference to § 6 of the Energy Saving Ordinance. The ventilation systems were not required to achieve Kfw 70.

Hello Nordanney,

Then €uro could actually shed some light in the dark

Maybe he will still

According to our planner we can do without the BDT, reference to § 6 of the Energy Saving Ordinance. The ventilation systems were not necessary to achieve KfW 70.

I can "only" report from our construction sites and there a BDT is generally mandatory for the BU; fully aware that it is not always required. Although in my opinion this is not entirely correct; I rather have the impression that the Energy Saving Ordinance can be interpreted differently in this regard. For us it has the simple background of encouraging the respective trades to "pay more attention"; to work more conscientiously. If this applies, the BDT is omitted accordingly and everyone is satisfied. The costs for a BDT are negligible, measured against the total construction volume and included in the fixed price.

If a ventilation system is installed, the BDT – as far as I know – is generally mandatory when KfW funds are used; regardless of whether it serves to achieve KfW "X" or not. Since otherwise the technical manager (sworn expert at court) would be on my back, I assume that there is an obligation.

Rhineland regards

I am not a lawyer, but is Kfw70 compliant construction = KFW70 standard? They do build in compliance with KFW70, but they are not obliged to confirm that?! The wording would make me suspicious.